diff --git a/gear-v3.scad b/gear-v3.scad
index ae6c419..377a29a 100644
--- a/gear-v3.scad
+++ b/gear-v3.scad
@@ -47,7 +47,8 @@
 // Overview of this file
 //-------------------------------------------
 
-/* 32-teeth planetary assembly */
+/* 32-teeth planetary assembly (1U ring gear with 24 teeth inside,
+   most compact, but centered only by satellites and 3 knobs) */
 
 /*rotate([0, 0, 10])
   ring_gear_1u_32t();
@@ -259,7 +260,7 @@ module ring_gear_1u_32t() {
     union() {
       translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, clearance=-0.1);
       translate([0, 0, 0.8]) cylinder($fn=32*2, h=6.4, r=3.06*(32/2-1)/3.1415926);
-      // notches, top
+      // top knobs
       translate([-12.8, 0, 6]) difference() {
         sphere($fn=30, r=2, center=true);
         translate([0, 0, -0.9]) cube(size=[6, 6, 4], center=true);
@@ -272,7 +273,7 @@ module ring_gear_1u_32t() {
         sphere($fn=30, r=2, center=true);
         translate([0, 0, -0.9]) cube(size=[6, 6, 4], center=true);
       }
-      // notches, bottom
+      // bottom knobs
       translate([-12.8, 0, 2]) difference() {
         sphere($fn=30, r=2, center=true);
         translate([0, 0, 0.9]) cube(size=[6, 6, 4], center=true);
@@ -288,8 +289,6 @@ module ring_gear_1u_32t() {
     }
     translate([0, 0, 1.8]) gear_teeth(mm_per_tooth=3.1415926, number_of_teeth=24, thickness=4.4, clearance=-0.1);
     translate([0, 0, -0.1]) cylinder($fn=32*2, h=8.2, r=(24/2-1));
-//    translate([0, 0, -0.1]) cylinder($fn=100, h=2.1, r=(24/2-1));
-//    translate([0, 0, 6]) cylinder($fn=100, h=2.1, r=(24/2-1));
   }
 }